shaffer



(No Model.)

M. E. SHAFFER.

NON INDUOTIVE ELEGTRIO CABLE.

Patented Sept. 9, 1884.

1.7V VENT lr A WITNESSES AT @W MARY E. SHAFFER, 'OF NEWV YORK, N. Y.

NON-INDUCTiVE ELECTRIC CABLE.

SPECIPICATEON forming part of Letters Patent No. 304:,759, datedSeptember 9, 1884:.

Application filed March 25, 1884.

To all whom it may concern:

Be it known that I, MARY E. Srmrrnn, a citizen of theUnited States,residing at New York, in the county of New York and State of New York,have invented certain new and useful Improvements in Non-InductiveElectric Cables; and I do hereby declare the fol lowing to bea full,clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame.

This invention relates to that ,class of electric conductors fortelegraphic or telephonic purposes which are formed into anon-inductivecable; and its object is to provide a simple and improvedcable which will obviate the injurious effects produced by induction,whereby a number of circuits may be worked in the same cable.

To this end my invention consists, substantially, in weaving about thelongitudinal wires of one or more circuits the wires of one or moreindependent circuits, substantially as will be hereinafter more fullyset forth.

In the drawings, Figure 1 is a plan view showing acable comprising twocircuits, and constructed after the manner of my invention. Fig. 2 is adetail transverse sectional view thereof. Fig. 3 is a plan viewillustrating a modification in the cable shown in Fig. 1. Fig. 4 is aplan View showing an improved cable comprising three circuits. Fig. 5 isa plan view of a larger cable constructed after the plan of themodification illustrated in Fig. 3. Fig. 6 is a transverse sectionalview, in detail, of this larger cable. Fig. 7 is a plan Viewillustrating another modified form of cable comprising two circuits.

Corresponding parts in the several figures are denoted by the sameletters of reference.

Referring to the drawings, A and A designate the wires which form oneelectric circuit, these wires being laid straight or longitudt nally, asshown. I) and b designate the wires of another circuit, these wiresbeing interwoven around the wires A A in any suitable manner. All thewires composing the cable are insulated by means of any suitablecovering, as shown at 2', Figs. 3 and 6, and the twisted or woven wiresb b are smaller than the longitudinal or straight wires AA. The smallerwiresb b of one circuit may be woven (No model.)

about the wires A A of the other circuit i In the cable shown in Fig. 4two circuits of small wires, as designated by b I) and c c, areprovided, the wires of each of these circuits being carried parallelwith each other, but the circuits being woven in opposite directionsabout the large wires A A. A large cable-such as shown in Figs. Sand6-may be formed after the manner of my invention by providing a numberof straight longitudinal wires, A A, B B, and C 0, each pair of wiresforming acircuit, when the small circuit-wires b I) are interwoven aboutall the larger wires to bind them together into a compact cable.

In the modification shown in Fig. 7 the small wires b b are. besidesbeing interwoven, coiled around the large wires, as shown at d.

In the. arrangement of my improved cable the wires of one round ormetallic circuit are preferably interwoven about the straight wires ofanother metallic circuit on a plane at or about right angles therewith,as shown in Fig. 5, by which relative arrangement the best results aresecured.

It will be observed that electric cables constructed in accordance withmy invention en1 body only the linewires of tl1e.different circuits, sothat there is no extra expense incurred for non-insulated binding-wiresor filling, such as are usually employed in cables to carry the inducedcurrent to the ground. Therefore my improved cables can be constructedat but a small extra expense over the first cost of the line-wires, andany number of circuits may be worked through them and the inducedcurrent will be taken up.

It is obvious that my invention is adapted for use either as an outsideline cable or conductor, or as an induction-killer to be attached to themain line at the oflice, and to extend inside the oflice.

I do not broadly claim an electrical cable independently and separatelyinterwoven, sub-.

stantially as set forth.

2. The combination, in an electric cable, with the straight orlongitudinal wires of one or more circuits, of the wires of one or moreindependent circuits interwoven about the said longitudinal wires,substantially as and for the purpose set forth.

a. The combination, in an electric cable, with the large longitudinal orstraight wires of one or more circuits, of the smaller wires of one ormore independent circuits, the smaller wires being interwovenalternately about the larger wires, substantially as and for the purposeset forth.

4. An improved electric cable composed of only thelinc-wires 01" two ormore circuits, the wires of the different circuits being of di.l'ie1.'cnt sizes and interwoven, substantially as and for the purpose setforth.

In testimony whereof I allix 1n ysignatu re in presence of twowitnesses.

MARY Ea SIIAFFER. Witnesses:

Hnninnn'r S. OGDEN, LEONARD S. lvjlrinn nn.

